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// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "hydrogen.h"
#include "hydrogen-osr.h"
namespace v8 {
namespace internal {
// True iff. we are compiling for OSR and the statement is the entry.
bool HOsrBuilder::HasOsrEntryAt(IterationStatement* statement) {
return statement->OsrEntryId() == builder_->current_info()->osr_ast_id();
}
HBasicBlock* HOsrBuilder::BuildOsrLoopEntry(IterationStatement* statement) {
ASSERT(HasOsrEntryAt(statement));
Zone* zone = builder_->zone();
HGraph* graph = builder_->graph();
// only one OSR point per compile is allowed.
ASSERT(graph->osr() == NULL);
// remember this builder as the one OSR builder in the graph.
graph->set_osr(this);
HBasicBlock* non_osr_entry = graph->CreateBasicBlock();
osr_entry_ = graph->CreateBasicBlock();
HValue* true_value = graph->GetConstantTrue();
HBranch* test = builder_->New<HBranch>(true_value, ToBooleanStub::Types(),
non_osr_entry, osr_entry_);
builder_->FinishCurrentBlock(test);
HBasicBlock* loop_predecessor = graph->CreateBasicBlock();
builder_->Goto(non_osr_entry, loop_predecessor);
builder_->set_current_block(osr_entry_);
osr_entry_->set_osr_entry();
BailoutId osr_entry_id = statement->OsrEntryId();
HEnvironment *environment = builder_->environment();
int first_expression_index = environment->first_expression_index();
int length = environment->length();
osr_values_ = new(zone) ZoneList<HUnknownOSRValue*>(length, zone);
for (int i = 0; i < first_expression_index; ++i) {
HUnknownOSRValue* osr_value
= builder_->Add<HUnknownOSRValue>(environment, i);
environment->Bind(i, osr_value);
osr_values_->Add(osr_value, zone);
}
if (first_expression_index != length) {
environment->Drop(length - first_expression_index);
for (int i = first_expression_index; i < length; ++i) {
HUnknownOSRValue* osr_value
= builder_->Add<HUnknownOSRValue>(environment, i);
environment->Push(osr_value);
osr_values_->Add(osr_value, zone);
}
}
unoptimized_frame_slots_ =
environment->local_count() + environment->push_count();
// Keep a copy of the old environment, since the OSR values need it
// to figure out where exactly they are located in the unoptimized frame.
environment = environment->Copy();
builder_->current_block()->UpdateEnvironment(environment);
builder_->Add<HSimulate>(osr_entry_id);
builder_->Add<HOsrEntry>(osr_entry_id);
HContext* context = builder_->Add<HContext>();
environment->BindContext(context);
builder_->Goto(loop_predecessor);
loop_predecessor->SetJoinId(statement->EntryId());
builder_->set_current_block(loop_predecessor);
// Create the final loop entry
osr_loop_entry_ = builder_->BuildLoopEntry();
return osr_loop_entry_;
}
void HOsrBuilder::FinishGraph() {
// do nothing for now.
}
void HOsrBuilder::FinishOsrValues() {
const ZoneList<HPhi*>* phis = osr_loop_entry_->phis();
for (int j = 0; j < phis->length(); j++) {
HPhi* phi = phis->at(j);
if (phi->HasMergedIndex()) {
osr_values_->at(phi->merged_index())->set_incoming_value(phi);
}
}
}
} } // namespace v8::internal
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